Marge Simpson, Patty Bouvier, and Selma Bouvier
Mr. Burns, Ned Flanders, Principal Skinner, Waylon Smithers, Kent Brockman, and others
Homer Simpson, Grampa Simpson, Barney Gumble, Krusty the Clown, Groundskeeper Willie, and others
Bart Simpson, Nelson Muntz, Ralph Wiggum, Todd Flanders, and others
Apu Nahasapeemapetilon, Moe Szyslak, Chief Wiggum, Comic Book Guy, Lou, and others
Agnes Skinner, Brandine Del Roy, Dolph and others
Stephen Hawking tells Homer that he is intrigued by his theory of a "donut-shaped universe". Some years later, cosmologists actually began to favor a donut-shaped (or toroidal) universe.
When Lisa is typing her angry letter to Springfield, her arm disappears in the mirror whenever she reaches up to reset the typewriter.
The plot for this episode appears on a collector card in level 4 of The Simpsons: Hit & Run video game.
They say the winner will be sent "straight to Maui" but the beach they show is in Honalulu. (Diamonhead is in the background)
Martin should be in Mensa as he has an IQ of 216
Although he skipped town earlier, a man closely resembling Mayor Quimby is seen with two women at the dog track.
The shadow under Hawking's wheelchair rotates at the wrong time.
The constellation Mensa IS visible from the Northern Hemisphere, but only if you are within a few degrees of the equator (despite what Lisa says).
Lisa has a typewriter in this episode, but in "Guess Who's Coming To Criticize Dinner", she had a desktop computer and in "A Tale of Two Springfields" she had a laptop computer.
Carl: Let's make litter out of these literati!
Lenny: That's too clever, you're one of THEM!
Homer: You said you were going to make me look sexier, but it's awfully dark in here.
Photographer: Light is not your friend.
Comic Book Guy: (dressed as Copernicus) Verily, I declare that the Earth revolves around the sun, and not t'other way round.
Lindsay Naegle: Stop looking down my blouse, Copernicus!
Comic Book Guy: Mine eyes doth rove of their own accord.
Lisa: We are a town of low-brows, no-brows and ignorami. We have eight malls, but no symphony. 32 bars, but no alternative theatre. 16 stores that begin with "Le Sex."
(At the gross-out contest)
Lisa: This is so embarrassing!
Marge: Lisa, did anyone force you to come here today?
Marge: Well, no one's forcing you to stay.
Lisa: Fine, then I'm leaving.
Marge: You're not going anywhere.
Homer: Look Lisa, I got runner-up prize!
Lisa: You won second place?
Homer: No, but I got it! (pause) Stealing is wrong.
Homer: I'm hot buttered, Check it and see!
I've got a fever of 453!
I'm hot, so very hot.
Hawking: Your theory of a donut shaped universe is intriguing Homer, I may have to steal it.
Homer: Wow, I can't believe someone I never heard of is hanging out with a guy like me.
Homer (to Lisa about Stephen Hawking): Did you have fun with your robot buddy?
Homer: Aww, but I was gonna score!
Marge: No you weren't.
Hibbert: (through an intercom) Lisa Simpson, are you ready to go on a voyage of intellectual self-discovery?
Lisa: I think so.
Hibbert: Is that a pie, or a quiche?
Lisa: A pie.
(Some murmuring over the intercom)
Hibbert: You may enter.
Lindsey Nagel: Do I detect a hint of sarcasm?
(The sarcasm detector starts beeping.)
Professor Frink: Are you kidding? This baby is off the charts!
Comic Book Guy: Ooh! A sarcasm detector! That's a REALLY useful invention!
(The sarcasm detector explodes.)
Comic Book Guy (to the tune of the "Star Trek: Original Series" theme song): I am smart, much smarter than you, Hibbert!
Moe: So who's paying?
Homer (using a robotic voice with his hand over his mouth): I-am.
Hawking: Hey, I didn't say that.
Stephen Hawking: Sometimes the smartest of us can be the most childish.
Lisa: Even you?
Stephen Hawking: No, not me. Never.
Homer: It's time to get Homer-erotic!
Homer: You're not going to ask me to pose nude, are you?
Photographer: Well, yes, unless you have issues about revealing your body.
Homer: I don't, but the Block Association seems to. THEY wanted a "traditional" Santa Claus.
First Appearance: Stephen Hawking.
During Homer's act in the contest in his popcorn suit, he alludes to the alternate title of this episode.
"I've got a fever of 453!"
The alternate title of this show is "Fahrenheit 453: The Temperature at Which Lisa Complains"
When Frink says that boxing is banned, several people including Homer cheer in favor of the ban. Perhaps Homer no longer likes boxing after his experiences as a prize fighter back in "The Homer They Fall".
Skinner put Springfield on "Metric Time", a fictional base-10 temporal system. There is no such thing although the idea is tempting.
This is the first appearance of generic character Lindsey Naegle.
Dick and Jane
Comic Book Guys shirt says, "C:/DOS C:/DOS/RUN RUN/DOS/RUN." Aside from being a computer joke, Comic Book Guys shirt refers to the series of Dick and Jane children's books, one of which is titled See Dick Run.
Homer: Larry Flynt is right! You guys stink!
Homer confuses Stephen Hawking with Larry Flynt, the publisher of "Hustler."
Comic Book Guy: Inspired by the most logical race in the galaxy, the Vulcans, breeding will be permitted once every seven years. For many of you, this will mean much less breeding. For me, much, much more.
Willie: You cannot do that, sir! You don't have the power!
Comic Book Guy knows that Vulcans breed every seven years because this was part of the plot of a Star Trek episode called "Amok Time." Also Willie's reply is an imitation of Chief Engineer Scotty.
Homer's "Hot Buttered" song is a parody of Foreigner's song "Hot Blooded."
Homer: Houston, we have a problem. A sexy problem!
When Homer is wearing an astronaut's helmet and little else, he repeats Tom Hanks' famous line from the 1995 movie Apollo 13. After the movie was released, the line "Houston, we have a problem" became a widely used catchphrase that could be used to describe even the most trivial of problems.
The couch gag (in which the couch is floating in water and an iceberg hits it and it sinks) is a reference to the 1912 sinking of the unsinkable Titanic.
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